Final answer:
The right and left atria are upper heart chambers that receive blood before it is pumped into the ventricles.
Explanation:
The right and left atria are the upper chambers of the heart that act as receiving chambers for blood to enter before being pumped into the lower chambers, the ventricles. The right atrium receives deoxygenated blood from the body via the superior and inferior vena cava, while the left atrium receives oxygenated blood from the lungs through the pulmonary veins.
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